diff options
| -rw-r--r-- | ubifs-utils/libubifs/super.c | 2219 |
1 files changed, 177 insertions, 2042 deletions
diff --git a/ubifs-utils/libubifs/super.c b/ubifs-utils/libubifs/super.c index 09e270d..1cbbfca 100644 --- a/ubifs-utils/libubifs/super.c +++ b/ubifs-utils/libubifs/super.c @@ -14,487 +14,190 @@ * corresponding subsystems, but most of it is here. */ -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/ctype.h> -#include <linux/kthread.h> -#include <linux/parser.h> -#include <linux/seq_file.h> -#include <linux/mount.h> -#include <linux/math64.h> -#include <linux/writeback.h> +#include <stdio.h> +#include <unistd.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include "linux_err.h" +#include "bitops.h" +#include "kmem.h" #include "ubifs.h" +#include "defs.h" +#include "debug.h" +#include "key.h" +#include "misc.h" -static int ubifs_default_version_set(const char *val, const struct kernel_param *kp) -{ - int n = 0, ret; - - ret = kstrtoint(val, 10, &n); - if (ret != 0 || n < 4 || n > UBIFS_FORMAT_VERSION) - return -EINVAL; - return param_set_int(val, kp); -} - -static const struct kernel_param_ops ubifs_default_version_ops = { - .set = ubifs_default_version_set, - .get = param_get_int, -}; - -int ubifs_default_version = UBIFS_FORMAT_VERSION; -module_param_cb(default_version, &ubifs_default_version_ops, &ubifs_default_version, 0600); - -/* - * Maximum amount of memory we may 'kmalloc()' without worrying that we are - * allocating too much. - */ -#define UBIFS_KMALLOC_OK (128*1024) - -/* Slab cache for UBIFS inodes */ -static struct kmem_cache *ubifs_inode_slab; - -/* UBIFS TNC shrinker description */ -static struct shrinker *ubifs_shrinker_info; +atomic_long_t ubifs_clean_zn_cnt; +static const int default_debug_level = WARN_LEVEL; /** - * validate_inode - validate inode. - * @c: UBIFS file-system description object - * @inode: the inode to validate + * open_ubi - open the libubi. + * @c: the UBIFS file-system description object + * @node: name of the UBI volume character device to fetch information about * - * This is a helper function for 'ubifs_iget()' which validates various fields - * of a newly built inode to make sure they contain sane values and prevent - * possible vulnerabilities. Returns zero if the inode is all right and - * a non-zero error code if not. + * This function opens libubi, and initialize device & volume information + * according to @node. Returns %0 in case of success and %-1 in case of failure. */ -static int validate_inode(struct ubifs_info *c, const struct inode *inode) +int open_ubi(struct ubifs_info *c, const char *node) { - int err; - const struct ubifs_inode *ui = ubifs_inode(inode); + struct stat st; - if (inode->i_size > c->max_inode_sz) { - ubifs_err(c, "inode is too large (%lld)", - (long long)inode->i_size); - return 1; - } + if (stat(node, &st) || !S_ISCHR(st.st_mode)) + return -1; - if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) { - ubifs_err(c, "unknown compression type %d", ui->compr_type); - return 2; - } + c->libubi = libubi_open(); + if (!c->libubi) + return -1; + if (ubi_get_vol_info(c->libubi, node, &c->vi)) + goto out_err; + if (ubi_get_dev_info1(c->libubi, c->vi.dev_num, &c->di)) + goto out_err; - if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX) - return 3; - - if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA) - return 4; - - if (ui->xattr && !S_ISREG(inode->i_mode)) - return 5; - - if (!ubifs_compr_present(c, ui->compr_type)) { - ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in", - inode->i_ino, ubifs_compr_name(c, ui->compr_type)); - } + return 0; - err = dbg_check_dir(c, inode); - return err; +out_err: + close_ubi(c); + return -1; } -struct inode *ubifs_iget(struct super_block *sb, unsigned long inum) +void close_ubi(struct ubifs_info *c) { - int err; - union ubifs_key key; - struct ubifs_ino_node *ino; - struct ubifs_info *c = sb->s_fs_info; - struct inode *inode; - struct ubifs_inode *ui; - - dbg_gen("inode %lu", inum); - - inode = iget_locked(sb, inum); - if (!inode) - return ERR_PTR(-ENOMEM); - if (!(inode->i_state & I_NEW)) - return inode; - ui = ubifs_inode(inode); - - ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS); - if (!ino) { - err = -ENOMEM; - goto out; + if (c->libubi) { + libubi_close(c->libubi); + c->libubi = NULL; } +} - ino_key_init(c, &key, inode->i_ino); +/** + * open_target - open the output target. + * @c: the UBIFS file-system description object + * + * Open the output target. The target can be an UBI volume + * or a file. + * + * Returns %0 in case of success and a negative error code in case of failure. + */ +int open_target(struct ubifs_info *c) +{ + if (c->libubi) { + c->dev_fd = open(c->dev_name, O_RDWR | O_EXCL); - err = ubifs_tnc_lookup(c, &key, ino); - if (err) - goto out_ino; - - inode->i_flags |= S_NOCMTIME; - - if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT)) - inode->i_flags |= S_NOATIME; - - set_nlink(inode, le32_to_cpu(ino->nlink)); - i_uid_write(inode, le32_to_cpu(ino->uid)); - i_gid_write(inode, le32_to_cpu(ino->gid)); - inode_set_atime(inode, (int64_t)le64_to_cpu(ino->atime_sec), - le32_to_cpu(ino->atime_nsec)); - inode_set_mtime(inode, (int64_t)le64_to_cpu(ino->mtime_sec), - le32_to_cpu(ino->mtime_nsec)); - inode_set_ctime(inode, (int64_t)le64_to_cpu(ino->ctime_sec), - le32_to_cpu(ino->ctime_nsec)); - inode->i_mode = le32_to_cpu(ino->mode); - inode->i_size = le64_to_cpu(ino->size); - - ui->data_len = le32_to_cpu(ino->data_len); - ui->flags = le32_to_cpu(ino->flags); - ui->compr_type = le16_to_cpu(ino->compr_type); - ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum); - ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt); - ui->xattr_size = le32_to_cpu(ino->xattr_size); - ui->xattr_names = le32_to_cpu(ino->xattr_names); - ui->synced_i_size = ui->ui_size = inode->i_size; - - ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0; - - err = validate_inode(c, inode); - if (err) - goto out_invalid; - - switch (inode->i_mode & S_IFMT) { - case S_IFREG: - inode->i_mapping->a_ops = &ubifs_file_address_operations; - inode->i_op = &ubifs_file_inode_operations; - inode->i_fop = &ubifs_file_operations; - if (ui->xattr) { - ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); - if (!ui->data) { - err = -ENOMEM; - goto out_ino; - } - memcpy(ui->data, ino->data, ui->data_len); - ((char *)ui->data)[ui->data_len] = '\0'; - } else if (ui->data_len != 0) { - err = 10; - goto out_invalid; + if (c->dev_fd == -1) { + ubifs_err(c, "cannot open the UBI volume. %s", + strerror(errno)); + return -errno; } - break; - case S_IFDIR: - inode->i_op = &ubifs_dir_inode_operations; - inode->i_fop = &ubifs_dir_operations; - if (ui->data_len != 0) { - err = 11; - goto out_invalid; - } - break; - case S_IFLNK: - inode->i_op = &ubifs_symlink_inode_operations; - if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) { - err = 12; - goto out_invalid; + if (ubi_set_property(c->dev_fd, UBI_VOL_PROP_DIRECT_WRITE, 1)) { + close(c->dev_fd); + ubifs_err(c, "ubi_set_property(set direct_write) failed. %s", + strerror(errno)); + return -errno; } - ui->data = kmalloc(ui->data_len + 1, GFP_NOFS); - if (!ui->data) { - err = -ENOMEM; - goto out_ino; - } - memcpy(ui->data, ino->data, ui->data_len); - ((char *)ui->data)[ui->data_len] = '\0'; - break; - case S_IFBLK: - case S_IFCHR: - { - dev_t rdev; - union ubifs_dev_desc *dev; - - ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); - if (!ui->data) { - err = -ENOMEM; - goto out_ino; - } - - dev = (union ubifs_dev_desc *)ino->data; - if (ui->data_len == sizeof(dev->new)) - rdev = new_decode_dev(le32_to_cpu(dev->new)); - else if (ui->data_len == sizeof(dev->huge)) - rdev = huge_decode_dev(le64_to_cpu(dev->huge)); - else { - err = 13; - goto out_invalid; + } else { + c->dev_fd = open(c->dev_name, O_CREAT | O_RDWR | O_TRUNC, + S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH); + if (c->dev_fd == -1) { + ubifs_err(c, "cannot create output file. %s", + strerror(errno)); + return -errno; } - memcpy(ui->data, ino->data, ui->data_len); - inode->i_op = &ubifs_file_inode_operations; - init_special_inode(inode, inode->i_mode, rdev); - break; } - case S_IFSOCK: - case S_IFIFO: - inode->i_op = &ubifs_file_inode_operations; - init_special_inode(inode, inode->i_mode, 0); - if (ui->data_len != 0) { - err = 14; - goto out_invalid; - } - break; - default: - err = 15; - goto out_invalid; - } - - kfree(ino); - ubifs_set_inode_flags(inode); - unlock_new_inode(inode); - return inode; - -out_invalid: - ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err); - ubifs_dump_node(c, ino, UBIFS_MAX_INO_NODE_SZ); - ubifs_dump_inode(c, inode); - err = -EINVAL; -out_ino: - kfree(ino); -out: - ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err); - iget_failed(inode); - return ERR_PTR(err); -} - -static struct inode *ubifs_alloc_inode(struct super_block *sb) -{ - struct ubifs_inode *ui; - - ui = alloc_inode_sb(sb, ubifs_inode_slab, GFP_NOFS); - if (!ui) - return NULL; - - memset((void *)ui + sizeof(struct inode), 0, - sizeof(struct ubifs_inode) - sizeof(struct inode)); - mutex_init(&ui->ui_mutex); - init_rwsem(&ui->xattr_sem); - spin_lock_init(&ui->ui_lock); - return &ui->vfs_inode; -}; - -static void ubifs_free_inode(struct inode *inode) -{ - struct ubifs_inode *ui = ubifs_inode(inode); - - kfree(ui->data); - fscrypt_free_inode(inode); - - kmem_cache_free(ubifs_inode_slab, ui); + return 0; } -/* - * Note, Linux write-back code calls this without 'i_mutex'. +/** + * close_target - close the output target. + * @c: the UBIFS file-system description object + * + * Close the output target. If the target was an UBI + * volume, also close libubi. + * + * Returns %0 in case of success and a negative error code in case of failure. */ -static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) -{ - int err = 0; - struct ubifs_info *c = inode->i_sb->s_fs_info; - struct ubifs_inode *ui = ubifs_inode(inode); - - ubifs_assert(c, !ui->xattr); - if (is_bad_inode(inode)) - return 0; - - mutex_lock(&ui->ui_mutex); - /* - * Due to races between write-back forced by budgeting - * (see 'sync_some_inodes()') and background write-back, the inode may - * have already been synchronized, do not do this again. This might - * also happen if it was synchronized in an VFS operation, e.g. - * 'ubifs_link()'. - */ - if (!ui->dirty) { - mutex_unlock(&ui->ui_mutex); - return 0; - } - - /* - * As an optimization, do not write orphan inodes to the media just - * because this is not needed. - */ - dbg_gen("inode %lu, mode %#x, nlink %u", - inode->i_ino, (int)inode->i_mode, inode->i_nlink); - if (inode->i_nlink) { - err = ubifs_jnl_write_inode(c, inode); - if (err) - ubifs_err(c, "can't write inode %lu, error %d", - inode->i_ino, err); - else - err = dbg_check_inode_size(c, inode, ui->ui_size); - } - - ui->dirty = 0; - mutex_unlock(&ui->ui_mutex); - ubifs_release_dirty_inode_budget(c, ui); - return err; -} - -static int ubifs_drop_inode(struct inode *inode) +int close_target(struct ubifs_info *c) { - int drop = generic_drop_inode(inode); - - if (!drop) - drop = fscrypt_drop_inode(inode); - - return drop; -} - -static void ubifs_evict_inode(struct inode *inode) -{ - int err; - struct ubifs_info *c = inode->i_sb->s_fs_info; - struct ubifs_inode *ui = ubifs_inode(inode); - - if (ui->xattr) - /* - * Extended attribute inode deletions are fully handled in - * 'ubifs_removexattr()'. These inodes are special and have - * limited usage, so there is nothing to do here. - */ - goto out; - - dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); - ubifs_assert(c, !atomic_read(&inode->i_count)); - - truncate_inode_pages_final(&inode->i_data); - - if (inode->i_nlink) - goto done; - - if (is_bad_inode(inode)) - goto out; - - ui->ui_size = inode->i_size = 0; - err = ubifs_jnl_delete_inode(c, inode); - if (err) - /* - * Worst case we have a lost orphan inode wasting space, so a - * simple error message is OK here. - */ - ubifs_err(c, "can't delete inode %lu, error %d", - inode->i_ino, err); - -out: - if (ui->dirty) - ubifs_release_dirty_inode_budget(c, ui); - else { - /* We've deleted something - clean the "no space" flags */ - c->bi.nospace = c->bi.nospace_rp = 0; - smp_wmb(); - } -done: - clear_inode(inode); - fscrypt_put_encryption_info(inode); -} - -static void ubifs_dirty_inode(struct inode *inode, int flags) -{ - struct ubifs_info *c = inode->i_sb->s_fs_info; - struct ubifs_inode *ui = ubifs_inode(inode); - - ubifs_assert(c, mutex_is_locked(&ui->ui_mutex)); - if (!ui->dirty) { - ui->dirty = 1; - dbg_gen("inode %lu", inode->i_ino); + if (c->dev_fd >= 0) { + if (c->libubi && ubi_set_property(c->dev_fd, UBI_VOL_PROP_DIRECT_WRITE, 0)) { + ubifs_err(c, "ubi_set_property(clear direct_write) failed. %s", + strerror(errno)); + return -errno; + } + if (close(c->dev_fd) == -1) { + ubifs_err(c, "cannot close the target. %s", + strerror(errno)); + return -errno; + } } -} - -static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) -{ - struct ubifs_info *c = dentry->d_sb->s_fs_info; - unsigned long long free; - __le32 *uuid = (__le32 *)c->uuid; - - free = ubifs_get_free_space(c); - dbg_gen("free space %lld bytes (%lld blocks)", - free, free >> UBIFS_BLOCK_SHIFT); - - buf->f_type = UBIFS_SUPER_MAGIC; - buf->f_bsize = UBIFS_BLOCK_SIZE; - buf->f_blocks = c->block_cnt; - buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; - if (free > c->report_rp_size) - buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; - else - buf->f_bavail = 0; - buf->f_files = 0; - buf->f_ffree = 0; - buf->f_namelen = UBIFS_MAX_NLEN; - buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); - buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); - ubifs_assert(c, buf->f_bfree <= c->block_cnt); return 0; } -static int ubifs_show_options(struct seq_file *s, struct dentry *root) +/** + * check_volume_empty - check if the UBI volume is empty. + * @c: the UBIFS file-system description object + * + * This function checks if the UBI volume is empty by looking if its LEBs are + * mapped or not. + * + * Returns %0 in case of success, %1 is the volume is not empty, + * and a negative error code in case of failure. + */ +int check_volume_empty(struct ubifs_info *c) { - struct ubifs_info *c = root->d_sb->s_fs_info; - - if (c->mount_opts.unmount_mode == 2) - seq_puts(s, ",fast_unmount"); - else if (c->mount_opts.unmount_mode == 1) - seq_puts(s, ",norm_unmount"); - - if (c->mount_opts.bulk_read == 2) - seq_puts(s, ",bulk_read"); - else if (c->mount_opts.bulk_read == 1) - seq_puts(s, ",no_bulk_read"); - - if (c->mount_opts.chk_data_crc == 2) - seq_puts(s, ",chk_data_crc"); - else if (c->mount_opts.chk_data_crc == 1) - seq_puts(s, ",no_chk_data_crc"); - - if (c->mount_opts.override_compr) { - seq_printf(s, ",compr=%s", - ubifs_compr_name(c, c->mount_opts.compr_type)); - } - - seq_printf(s, ",assert=%s", ubifs_assert_action_name(c)); - seq_printf(s, ",ubi=%d,vol=%d", c->vi.ubi_num, c->vi.vol_id); + int lnum, err; + for (lnum = 0; lnum < c->vi.rsvd_lebs; lnum++) { + err = ubi_is_mapped(c->dev_fd, lnum); + if (err < 0) + return err; + if (err == 1) + return 1; + } return 0; } -static int ubifs_sync_fs(struct super_block *sb, int wait) -{ - int i, err; - struct ubifs_info *c = sb->s_fs_info; - - /* - * Zero @wait is just an advisory thing to help the file system shove - * lots of data into the queues, and there will be the second - * '->sync_fs()' call, with non-zero @wait. - */ - if (!wait) - return 0; - - /* - * Synchronize write buffers, because 'ubifs_run_commit()' does not - * do this if it waits for an already running commit. - */ - for (i = 0; i < c->jhead_cnt; i++) { - err = ubifs_wbuf_sync(&c->jheads[i].wbuf); - if (err) - return err; +void init_ubifs_info(struct ubifs_info *c, int program_type) +{ + spin_lock_init(&c->cnt_lock); + spin_lock_init(&c->cs_lock); + spin_lock_init(&c->buds_lock); + spin_lock_init(&c->space_lock); + spin_lock_init(&c->orphan_lock); + init_rwsem(&c->commit_sem); + mutex_init(&c->lp_mutex); + mutex_init(&c->tnc_mutex); + mutex_init(&c->log_mutex); + c->buds = RB_ROOT; + c->old_idx = RB_ROOT; + c->size_tree = RB_ROOT; + c->orph_tree = RB_ROOT; + INIT_LIST_HEAD(&c->idx_gc); + INIT_LIST_HEAD(&c->replay_list); + INIT_LIST_HEAD(&c->replay_buds); + INIT_LIST_HEAD(&c->uncat_list); + INIT_LIST_HEAD(&c->empty_list); + INIT_LIST_HEAD(&c->freeable_list); + INIT_LIST_HEAD(&c->frdi_idx_list); + INIT_LIST_HEAD(&c->unclean_leb_list); + INIT_LIST_HEAD(&c->old_buds); + INIT_LIST_HEAD(&c->orph_list); + INIT_LIST_HEAD(&c->orph_new); + c->no_chk_data_crc = 1; + + c->highest_inum = UBIFS_FIRST_INO; + c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; + + c->program_type = program_type; + switch (c->program_type) { + case MKFS_PROGRAM_TYPE: + c->program_name = MKFS_PROGRAM_NAME; + break; + default: + assert(0); + break; } - - /* - * Strictly speaking, it is not necessary to commit the journal here, - * synchronizing write-buffers would be enough. But committing makes - * UBIFS free space predictions much more accurate, so we want to let - * the user be able to get more accurate results of 'statfs()' after - * they synchronize the file system. - */ - err = ubifs_run_commit(c); - if (err) - return err; - - return ubi_sync(c->vi.ubi_num); + c->dev_fd = -1; + c->debug_level = default_debug_level; } /** @@ -506,46 +209,49 @@ static int ubifs_sync_fs(struct super_block *sb, int wait) * requirements. Returns zero in case of success and a negative error code in * case of failure. */ -static int init_constants_early(struct ubifs_info *c) +int init_constants_early(struct ubifs_info *c) { +#define NOR_MAX_WRITESZ 64 if (c->vi.corrupted) { ubifs_warn(c, "UBI volume is corrupted - read-only mode"); c->ro_media = 1; } - if (c->di.ro_mode) { - ubifs_msg(c, "read-only UBI device"); - c->ro_media = 1; - } - - if (c->vi.vol_type == UBI_STATIC_VOLUME) { + if (c->vi.type == UBI_STATIC_VOLUME) { ubifs_msg(c, "static UBI volume - read-only mode"); c->ro_media = 1; } - c->leb_cnt = c->vi.size; - c->leb_size = c->vi.usable_leb_size; - c->leb_start = c->di.leb_start; + c->max_inode_sz = key_max_inode_size(c); + c->leb_cnt = c->vi.rsvd_lebs; + c->leb_size = c->vi.leb_size; c->half_leb_size = c->leb_size / 2; c->min_io_size = c->di.min_io_size; c->min_io_shift = fls(c->min_io_size) - 1; - c->max_write_size = c->di.max_write_size; + if (c->min_io_size == 1) + /* + * Different from linux kernel, the max write size of nor flash + * is not exposed in sysfs, just reset @c->max_write_size. + */ + c->max_write_size = NOR_MAX_WRITESZ; + else + c->max_write_size = c->di.min_io_size; c->max_write_shift = fls(c->max_write_size) - 1; if (c->leb_size < UBIFS_MIN_LEB_SZ) { - ubifs_errc(c, "too small LEBs (%d bytes), min. is %d bytes", - c->leb_size, UBIFS_MIN_LEB_SZ); + ubifs_err(c, "too small LEBs (%d bytes), min. is %d bytes", + c->leb_size, UBIFS_MIN_LEB_SZ); return -EINVAL; } if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { - ubifs_errc(c, "too few LEBs (%d), min. is %d", - c->leb_cnt, UBIFS_MIN_LEB_CNT); + ubifs_err(c, "too few LEBs (%d), min. is %d", + c->leb_cnt, UBIFS_MIN_LEB_CNT); return -EINVAL; } if (!is_power_of_2(c->min_io_size)) { - ubifs_errc(c, "bad min. I/O size %d", c->min_io_size); + ubifs_err(c, "bad min. I/O size %d", c->min_io_size); return -EINVAL; } @@ -556,8 +262,8 @@ static int init_constants_early(struct ubifs_info *c) if (c->max_write_size < c->min_io_size || c->max_write_size % c->min_io_size || !is_power_of_2(c->max_write_size)) { - ubifs_errc(c, "bad write buffer size %d for %d min. I/O unit", - c->max_write_size, c->min_io_size); + ubifs_err(c, "bad write buffer size %d for %d min. I/O unit", + c->max_write_size, c->min_io_size); return -EINVAL; } @@ -630,11 +336,6 @@ static int init_constants_early(struct ubifs_info *c) */ c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; - /* Buffer size for bulk-reads */ - c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; - if (c->max_bu_buf_len > c->leb_size) - c->max_bu_buf_len = c->leb_size; - /* Log is ready, preserve one LEB for commits. */ c->min_log_bytes = c->leb_size; @@ -670,7 +371,7 @@ static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) * makes sure they are all right. Returns zero in case of success and a * negative error code in case of failure. */ -static int init_constants_sb(struct ubifs_info *c) +int init_constants_sb(struct ubifs_info *c) { int tmp, err; long long tmp64; @@ -760,26 +461,9 @@ static int init_constants_sb(struct ubifs_info *c) * the master node has been read. It also checks various UBIFS parameters and * makes sure they are all right. */ -static void init_constants_master(struct ubifs_info *c) +void init_constants_master(struct ubifs_info *c) { - long long tmp64; - c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); - c->report_rp_size = ubifs_reported_space(c, c->rp_size); - - /* - * Calculate total amount of FS blocks. This number is not used - * internally because it does not make much sense for UBIFS, but it is - * necessary to report something for the 'statfs()' call. - * - * Subtract the LEB reserved for GC, the LEB which is reserved for - * deletions, minimum LEBs for the index, and assume only one journal - * head is available. - */ - tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; - tmp64 *= (long long)c->leb_size - c->leb_overhead; - tmp64 = ubifs_reported_space(c, tmp64); - c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; } /** @@ -793,7 +477,7 @@ static void init_constants_master(struct ubifs_info *c) * returns zero in case of success and a negative error code in case of * failure. */ -static int take_gc_lnum(struct ubifs_info *c) +int take_gc_lnum(struct ubifs_info *c) { int err; @@ -815,7 +499,7 @@ static int take_gc_lnum(struct ubifs_info *c) * This helper function allocates and initializes UBIFS write-buffers. Returns * zero in case of success and %-ENOMEM in case of failure. */ -static int alloc_wbufs(struct ubifs_info *c) +int alloc_wbufs(struct ubifs_info *c) { int i, err; @@ -845,7 +529,6 @@ static int alloc_wbufs(struct ubifs_info *c) * Garbage Collector head does not need to be synchronized by timer. * Also GC head nodes are not grouped. */ - c->jheads[GCHD].wbuf.no_timer = 1; c->jheads[GCHD].grouped = 0; return 0; @@ -870,7 +553,7 @@ out_wbuf: * free_wbufs - free write-buffers. * @c: UBIFS file-system description object */ -static void free_wbufs(struct ubifs_info *c) +void free_wbufs(struct ubifs_info *c) { int i; @@ -889,7 +572,7 @@ static void free_wbufs(struct ubifs_info *c) * free_orphans - free orphans. * @c: UBIFS file-system description object */ -static void free_orphans(struct ubifs_info *c) +void free_orphans(struct ubifs_info *c) { struct ubifs_orphan *orph; @@ -926,257 +609,13 @@ static void free_buds(struct ubifs_info *c) } /** - * check_volume_empty - check if the UBI volume is empty. - * @c: UBIFS file-system description object - * - * This function checks if the UBIFS volume is empty by looking if its LEBs are - * mapped or not. The result of checking is stored in the @c->empty variable. - * Returns zero in case of success and a negative error code in case of - * failure. - */ -static int check_volume_empty(struct ubifs_info *c) -{ - int lnum, err; - - c->empty = 1; - for (lnum = 0; lnum < c->leb_cnt; lnum++) { - err = ubifs_is_mapped(c, lnum); - if (unlikely(err < 0)) - return err; - if (err == 1) { - c->empty = 0; - break; - } - - cond_resched(); - } - - return 0; -} - -/* - * UBIFS mount options. - * - * Opt_fast_unmount: do not run a journal commit before un-mounting - * Opt_norm_unmount: run a journal commit before un-mounting - * Opt_bulk_read: enable bulk-reads - * Opt_no_bulk_read: disable bulk-reads - * Opt_chk_data_crc: check CRCs when reading data nodes - * Opt_no_chk_data_crc: do not check CRCs when reading data nodes - * Opt_override_compr: override default compressor - * Opt_assert: set ubifs_assert() action - * Opt_auth_key: The key name used for authentication - * Opt_auth_hash_name: The hash type used for authentication - * Opt_err: just end of array marker - */ -enum { - Opt_fast_unmount, - Opt_norm_unmount, - Opt_bulk_read, - Opt_no_bulk_read, - Opt_chk_data_crc, - Opt_no_chk_data_crc, - Opt_override_compr, - Opt_assert, - Opt_auth_key, - Opt_auth_hash_name, - Opt_ignore, - Opt_err, -}; - -static const match_table_t tokens = { - {Opt_fast_unmount, "fast_unmount"}, - {Opt_norm_unmount, "norm_unmount"}, - {Opt_bulk_read, "bulk_read"}, - {Opt_no_bulk_read, "no_bulk_read"}, - {Opt_chk_data_crc, "chk_data_crc"}, - {Opt_no_chk_data_crc, "no_chk_data_crc"}, - {Opt_override_compr, "compr=%s"}, - {Opt_auth_key, "auth_key=%s"}, - {Opt_auth_hash_name, "auth_hash_name=%s"}, - {Opt_ignore, "ubi=%s"}, - {Opt_ignore, "vol=%s"}, - {Opt_assert, "assert=%s"}, - {Opt_err, NULL}, -}; - -/** - * parse_standard_option - parse a standard mount option. - * @option: the option to parse - * - * Normally, standard mount options like "sync" are passed to file-systems as - * flags. However, when a "rootflags=" kernel boot parameter is used, they may - * be present in the options string. This function tries to deal with this - * situation and parse standard options. Returns 0 if the option was not - * recognized, and the corresponding integer flag if it was. - * - * UBIFS is only interested in the "sync" option, so do not check for anything - * else. - */ -static int parse_standard_option(const char *option) -{ - - pr_notice("UBIFS: parse %s\n", option); - if (!strcmp(option, "sync")) - return SB_SYNCHRONOUS; - return 0; -} - -/** - * ubifs_parse_options - parse mount parameters. - * @c: UBIFS file-system description object - * @options: parameters to parse - * @is_remount: non-zero if this is FS re-mount - * - * This function parses UBIFS mount options and returns zero in case success - * and a negative error code in case of failure. - */ -static int ubifs_parse_options(struct ubifs_info *c, char *options, - int is_remount) -{ - char *p; - substring_t args[MAX_OPT_ARGS]; - - if (!options) - return 0; - - while ((p = strsep(&options, ","))) { - int token; - - if (!*p) - continue; - - token = match_token(p, tokens, args); - switch (token) { - /* - * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. - * We accept them in order to be backward-compatible. But this - * should be removed at some point. - */ - case Opt_fast_unmount: - c->mount_opts.unmount_mode = 2; - break; - case Opt_norm_unmount: - c->mount_opts.unmount_mode = 1; - break; - case Opt_bulk_read: - c->mount_opts.bulk_read = 2; - c->bulk_read = 1; - break; - case Opt_no_bulk_read: - c->mount_opts.bulk_read = 1; - c->bulk_read = 0; - break; - case Opt_chk_data_crc: - c->mount_opts.chk_data_crc = 2; - c->no_chk_data_crc = 0; - break; - case Opt_no_chk_data_crc: - c->mount_opts.chk_data_crc = 1; - c->no_chk_data_crc = 1; - break; - case Opt_override_compr: - { - char *name = match_strdup(&args[0]); - - if (!name) - return -ENOMEM; - if (!strcmp(name, "none")) - c->mount_opts.compr_type = UBIFS_COMPR_NONE; - else if (!strcmp(name, "lzo")) - c->mount_opts.compr_type = UBIFS_COMPR_LZO; - else if (!strcmp(name, "zlib")) - c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; - else if (!strcmp(name, "zstd")) - c->mount_opts.compr_type = UBIFS_COMPR_ZSTD; - else { - ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready? - kfree(name); - return -EINVAL; - } - kfree(name); - c->mount_opts.override_compr = 1; - c->default_compr = c->mount_opts.compr_type; - break; - } - case Opt_assert: - { - char *act = match_strdup(&args[0]); - - if (!act) - return -ENOMEM; - if (!strcmp(act, "report")) - c->assert_action = ASSACT_REPORT; - else if (!strcmp(act, "read-only")) - c->assert_action = ASSACT_RO; - else if (!strcmp(act, "panic")) - c->assert_action = ASSACT_PANIC; - else { - ubifs_err(c, "unknown assert action \"%s\"", act); - kfree(act); - return -EINVAL; - } - kfree(act); - break; - } - case Opt_auth_key: - if (!is_remount) { - c->auth_key_name = kstrdup(args[0].from, - GFP_KERNEL); - if (!c->auth_key_name) - return -ENOMEM; - } - break; - case Opt_auth_hash_name: - if (!is_remount) { - c->auth_hash_name = kstrdup(args[0].from, - GFP_KERNEL); - if (!c->auth_hash_name) - return -ENOMEM; - } - break; - case Opt_ignore: - break; - default: - { - unsigned long flag; - struct super_block *sb = c->vfs_sb; - - flag = parse_standard_option(p); - if (!flag) { - ubifs_err(c, "unrecognized mount option \"%s\" or missing value", - p); - return -EINVAL; - } - sb->s_flags |= flag; - break; - } - } - } - - return 0; -} - -/* - * ubifs_release_options - release mount parameters which have been dumped. - * @c: UBIFS file-system description object - */ -static void ubifs_release_options(struct ubifs_info *c) -{ - kfree(c->auth_key_name); - c->auth_key_name = NULL; - kfree(c->auth_hash_name); - c->auth_hash_name = NULL; -} - -/** * destroy_journal - destroy journal data structures. * @c: UBIFS file-system description object * * This function destroys journal data structures including those that may have * been created by recovery functions. */ -static void destroy_journal(struct ubifs_info *c) +void destroy_journal(struct ubifs_info *c) { while (!list_empty(&c->unclean_leb_list)) { struct ubifs_unclean_leb *ucleb; @@ -1199,1307 +638,3 @@ static void destroy_journal(struct ubifs_info *c) ubifs_tnc_close(c); free_buds(c); } - -/** - * bu_init - initialize bulk-read information. - * @c: UBIFS file-system description object - */ -static void bu_init(struct ubifs_info *c) -{ - ubifs_assert(c, c->bulk_read == 1); - - if (c->bu.buf) - return; /* Already initialized */ - -again: - c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); - if (!c->bu.buf) { - if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { - c->max_bu_buf_len = UBIFS_KMALLOC_OK; - goto again; - } - - /* Just disable bulk-read */ - ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it", - c->max_bu_buf_len); - c->mount_opts.bulk_read = 1; - c->bulk_read = 0; - return; - } -} - -/** - * check_free_space - check if there is enough free space to mount. - * @c: UBIFS file-system description object - * - * This function makes sure UBIFS has enough free space to be mounted in - * read/write mode. UBIFS must always have some free space to allow deletions. - */ -static int check_free_space(struct ubifs_info *c) -{ - ubifs_assert(c, c->dark_wm > 0); - if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { - ubifs_err(c, "insufficient free space to mount in R/W mode"); - ubifs_dump_budg(c, &c->bi); - ubifs_dump_lprops(c); - return -ENOSPC; - } - return 0; -} - -/** - * mount_ubifs - mount UBIFS file-system. - * @c: UBIFS file-system description object - * - * This function mounts UBIFS file system. Returns zero in case of success and - * a negative error code in case of failure. - */ -static int mount_ubifs(struct ubifs_info *c) -{ - int err; - long long x, y; - size_t sz; - - c->ro_mount = !!sb_rdonly(c->vfs_sb); - /* Suppress error messages while probing if SB_SILENT is set */ - c->probing = !!(c->vfs_sb->s_flags & SB_SILENT); - - err = init_constants_early(c); - if (err) - return err; - - err = ubifs_debugging_init(c); - if (err) - return err; - - err = ubifs_sysfs_register(c); - if (err) - goto out_debugging; - - err = check_volume_empty(c); - if (err) - goto out_free; - - if (c->empty && (c->ro_mount || c->ro_media)) { - /* - * This UBI volume is empty, and read-only, or the file system - * is mounted read-only - we cannot format it. - */ - ubifs_err(c, "can't format empty UBI volume: read-only %s", - c->ro_media ? "UBI volume" : "mount"); - err = -EROFS; - goto out_free; - } - - if (c->ro_media && !c->ro_mount) { - ubifs_err(c, "cannot mount read-write - read-only media"); - err = -EROFS; - goto out_free; - } - - /* - * The requirement for the buffer is that it should fit indexing B-tree - * height amount of integers. We assume the height if the TNC tree will - * never exceed 64. - */ - err = -ENOMEM; - c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int), - GFP_KERNEL); - if (!c->bottom_up_buf) - goto out_free; - - c->sbuf = vmalloc(c->leb_size); - if (!c->sbuf) - goto out_free; - - if (!c->ro_mount) { - c->ileb_buf = vmalloc(c->leb_size); - if (!c->ileb_buf) - goto out_free; - } - - if (c->bulk_read == 1) - bu_init(c); - - if (!c->ro_mount) { - c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ - UBIFS_CIPHER_BLOCK_SIZE, - GFP_KERNEL); - if (!c->write_reserve_buf) - goto out_free; - } - - c->mounting = 1; - - if (c->auth_key_name) { - if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) { - err = ubifs_init_authentication(c); - if (err) - goto out_free; - } else { - ubifs_err(c, "auth_key_name, but UBIFS is built without" - " authentication support"); - err = -EINVAL; - goto out_free; - } - } - - err = ubifs_read_superblock(c); - if (err) - goto out_auth; - - c->probing = 0; - - /* - * Make sure the compressor which is set as default in the superblock - * or overridden by mount options is actually compiled in. - */ - if (!ubifs_compr_present(c, c->default_compr)) { - ubifs_err(c, "'compressor \"%s\" is not compiled in", - ubifs_compr_name(c, c->default_compr)); - err = -ENOTSUPP; - goto out_auth; - } - - err = init_constants_sb(c); - if (err) - goto out_auth; - - sz = ALIGN(c->max_idx_node_sz, c->min_io_size) * 2; - c->cbuf = kmalloc(sz, GFP_NOFS); - if (!c->cbuf) { - err = -ENOMEM; - goto out_auth; - } - - err = alloc_wbufs(c); - if (err) - goto out_cbuf; - - sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); - if (!c->ro_mount) { - /* Create background thread */ - c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name); - if (IS_ERR(c->bgt)) { - err = PTR_ERR(c->bgt); - c->bgt = NULL; - ubifs_err(c, "cannot spawn \"%s\", error %d", - c->bgt_name, err); - goto out_wbufs; - } - } - - err = ubifs_read_master(c); - if (err) - goto out_master; - - init_constants_master(c); - - if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { - ubifs_msg(c, "recovery needed"); - c->need_recovery = 1; - } - - if (c->need_recovery && !c->ro_mount) { - err = ubifs_recover_inl_heads(c, c->sbuf); - if (err) - goto out_master; - } - - err = ubifs_lpt_init(c, 1, !c->ro_mount); - if (err) - goto out_master; - - if (!c->ro_mount && c->space_fixup) { - err = ubifs_fixup_free_space(c); - if (err) - goto out_lpt; - } - - if (!c->ro_mount && !c->need_recovery) { - /* - * Set the "dirty" flag so that if we reboot uncleanly we - * will notice this immediately on the next mount. - */ - c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); - err = ubifs_write_master(c); - if (err) - goto out_lpt; - } - - /* - * Handle offline signed images: Now that the master node is - * written and its validation no longer depends on the hash - * in the superblock, we can update the offline signed - * superblock with a HMAC version, - */ - if (ubifs_authenticated(c) && ubifs_hmac_zero(c, c->sup_node->hmac)) { - err = ubifs_hmac_wkm(c, c->sup_node->hmac_wkm); - if (err) - goto out_lpt; - c->superblock_need_write = 1; - } - - if (!c->ro_mount && c->superblock_need_write) { - err = ubifs_write_sb_node(c, c->sup_node); - if (err) - goto out_lpt; - c->superblock_need_write = 0; - } - - err = dbg_check_idx_size(c, c->bi.old_idx_sz); - if (err) - goto out_lpt; - - err = ubifs_replay_journal(c); - if (err) - goto out_journal; - - /* Calculate 'min_idx_lebs' after journal replay */ - c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); - - err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount); - if (err) - goto out_orphans; - - if (!c->ro_mount) { - int lnum; - - err = check_free_space(c); - if (err) - goto out_orphans; - - /* Check for enough log space */ - lnum = c->lhead_lnum + 1; - if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) - lnum = UBIFS_LOG_LNUM; - if (lnum == c->ltail_lnum) { - err = ubifs_consolidate_log(c); - if (err) - goto out_orphans; - } - - if (c->need_recovery) { - if (!ubifs_authenticated(c)) { - err = ubifs_recover_size(c, true); - if (err) - goto out_orphans; - } - - err = ubifs_rcvry_gc_commit(c); - if (err) - goto out_orphans; - - if (ubifs_authenticated(c)) { - err = ubifs_recover_size(c, false); - if (err) - goto out_orphans; - } - } else { - err = take_gc_lnum(c); - if (err) - goto out_orphans; - - /* - * GC LEB may contain garbage if there was an unclean - * reboot, and it should be un-mapped. - */ - err = ubifs_leb_unmap(c, c->gc_lnum); - if (err) - goto out_orphans; - } - - err = dbg_check_lprops(c); - if (err) - goto out_orphans; - } else if (c->need_recovery) { - err = ubifs_recover_size(c, false); - if (err) - goto out_orphans; - } else { - /* - * Even if we mount read-only, we have to set space in GC LEB - * to proper value because this affects UBIFS free space - * reporting. We do not want to have a situation when - * re-mounting from R/O to R/W changes amount of free space. - */ - err = take_gc_lnum(c); - if (err) - goto out_orphans; - } - - spin_lock(&ubifs_infos_lock); - list_add_tail(&c->infos_list, &ubifs_infos); - spin_unlock(&ubifs_infos_lock); - - if (c->need_recovery) { - if (c->ro_mount) - ubifs_msg(c, "recovery deferred"); - else { - c->need_recovery = 0; - ubifs_msg(c, "recovery completed"); - /* - * GC LEB has to be empty and taken at this point. But - * the journal head LEBs may also be accounted as - * "empty taken" if they are empty. - */ - ubifs_assert(c, c->lst.taken_empty_lebs > 0); - } - } else - ubifs_assert(c, c->lst.taken_empty_lebs > 0); - - err = dbg_check_filesystem(c); - if (err) - goto out_infos; - - dbg_debugfs_init_fs(c); - - c->mounting = 0; - - ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s", - c->vi.ubi_num, c->vi.vol_id, c->vi.name, - c->ro_mount ? ", R/O mode" : ""); - x = (long long)c->main_lebs * c->leb_size; - y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; - ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes", - c->leb_size, c->leb_size >> 10, c->min_io_size, - c->max_write_size); - ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), max %d LEBs, journal size %lld bytes (%lld MiB, %d LEBs)", - x, x >> 20, c->main_lebs, c->max_leb_cnt, - y, y >> 20, c->log_lebs + c->max_bud_cnt); - ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)", - c->report_rp_size, c->report_rp_size >> 10); - ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s", - c->fmt_version, c->ro_compat_version, - UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid, - c->big_lpt ? ", big LPT model" : ", small LPT model"); - - dbg_gen("default compressor: %s", ubifs_compr_name(c, c->default_compr)); - dbg_gen("data journal heads: %d", - c->jhead_cnt - NONDATA_JHEADS_CNT); - dbg_gen("log LEBs: %d (%d - %d)", - c->log_lebs, UBIFS_LOG_LNUM, c->log_last); - dbg_gen("LPT area LEBs: %d (%d - %d)", - c->lpt_lebs, c->lpt_first, c->lpt_last); - dbg_gen("orphan area LEBs: %d (%d - %d)", - c->orph_lebs, c->orph_first, c->orph_last); - dbg_gen("main area LEBs: %d (%d - %d)", - c->main_lebs, c->main_first, c->leb_cnt - 1); - dbg_gen("index LEBs: %d", c->lst.idx_lebs); - dbg_gen("total index bytes: %llu (%llu KiB, %llu MiB)", - c->bi.old_idx_sz, c->bi.old_idx_sz >> 10, - c->bi.old_idx_sz >> 20); - dbg_gen("key hash type: %d", c->key_hash_type); - dbg_gen("tree fanout: %d", c->fanout); - dbg_gen("reserved GC LEB: %d", c->gc_lnum); - dbg_gen("max. znode size %d", c->max_znode_sz); - dbg_gen("max. index node size %d", c->max_idx_node_sz); - dbg_gen("node sizes: data %zu, inode %zu, dentry %zu", - UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); - dbg_gen("node sizes: trun %zu, sb %zu, master %zu", - UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); - dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu", - UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); - dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d", - UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, - UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout)); - dbg_gen("dead watermark: %d", c->dead_wm); - dbg_gen("dark watermark: %d", c->dark_wm); - dbg_gen("LEB overhead: %d", c->leb_overhead); - x = (long long)c->main_lebs * c->dark_wm; - dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)", - x, x >> 10, x >> 20); - dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)", - c->max_bud_bytes, c->max_bud_bytes >> 10, - c->max_bud_bytes >> 20); - dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", - c->bg_bud_bytes, c->bg_bud_bytes >> 10, - c->bg_bud_bytes >> 20); - dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)", - c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); - dbg_gen("max. seq. number: %llu", c->max_sqnum); - dbg_gen("commit number: %llu", c->cmt_no); - dbg_gen("max. xattrs per inode: %d", ubifs_xattr_max_cnt(c)); - dbg_gen("max orphans: %d", c->max_orphans); - - return 0; - -out_infos: - spin_lock(&ubifs_infos_lock); - list_del(&c->infos_list); - spin_unlock(&ubifs_infos_lock); -out_orphans: - free_orphans(c); -out_journal: - destroy_journal(c); -out_lpt: - ubifs_lpt_free(c, 0); -out_master: - kfree(c->mst_node); - kfree(c->rcvrd_mst_node); - if (c->bgt) - kthread_stop(c->bgt); -out_wbufs: - free_wbufs(c); -out_cbuf: - kfree(c->cbuf); -out_auth: - ubifs_exit_authentication(c); -out_free: - kfree(c->write_reserve_buf); - kfree(c->bu.buf); - vfree(c->ileb_buf); - vfree(c->sbuf); - kfree(c->bottom_up_buf); - kfree(c->sup_node); - ubifs_sysfs_unregister(c); -out_debugging: - ubifs_debugging_exit(c); - return err; -} - -/** - * ubifs_umount - un-mount UBIFS file-system. - * @c: UBIFS file-system description object - * - * Note, this function is called to free allocated resourced when un-mounting, - * as well as free resources when an error occurred while we were half way - * through mounting (error path cleanup function). So it has to make sure the - * resource was actually allocated before freeing it. - */ -static void ubifs_umount(struct ubifs_info *c) -{ - dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, - c->vi.vol_id); - - dbg_debugfs_exit_fs(c); - spin_lock(&ubifs_infos_lock); - list_del(&c->infos_list); - spin_unlock(&ubifs_infos_lock); - - if (c->bgt) - kthread_stop(c->bgt); - - destroy_journal(c); - free_wbufs(c); - free_orphans(c); - ubifs_lpt_free(c, 0); - ubifs_exit_authentication(c); - - ubifs_release_options(c); - kfree(c->cbuf); - kfree(c->rcvrd_mst_node); - kfree(c->mst_node); - kfree(c->write_reserve_buf); - kfree(c->bu.buf); - vfree(c->ileb_buf); - vfree(c->sbuf); - kfree(c->bottom_up_buf); - kfree(c->sup_node); - ubifs_debugging_exit(c); - ubifs_sysfs_unregister(c); -} - -/** - * ubifs_remount_rw - re-mount in read-write mode. - * @c: UBIFS file-system description object - * - * UBIFS avoids allocating many unnecessary resources when mounted in read-only - * mode. This function allocates the needed resources and re-mounts UBIFS in - * read-write mode. - */ -static int ubifs_remount_rw(struct ubifs_info *c) -{ - int err, lnum; - - if (c->rw_incompat) { - ubifs_err(c, "the file-system is not R/W-compatible"); - ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d", - c->fmt_version, c->ro_compat_version, - UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); - return -EROFS; - } - - mutex_lock(&c->umount_mutex); - dbg_save_space_info(c); - c->remounting_rw = 1; - c->ro_mount = 0; - - if (c->space_fixup) { - err = ubifs_fixup_free_space(c); - if (err) - goto out; - } - - err = check_free_space(c); - if (err) - goto out; - - if (c->need_recovery) { - ubifs_msg(c, "completing deferred recovery"); - err = ubifs_write_rcvrd_mst_node(c); - if (err) - goto out; - if (!ubifs_authenticated(c)) { - err = ubifs_recover_size(c, true); - if (err) - goto out; - } - err = ubifs_clean_lebs(c, c->sbuf); - if (err) - goto out; - err = ubifs_recover_inl_heads(c, c->sbuf); - if (err) - goto out; - } else { - /* A readonly mount is not allowed to have orphans */ - ubifs_assert(c, c->tot_orphans == 0); - err = ubifs_clear_orphans(c); - if (err) - goto out; - } - - if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { - c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); - err = ubifs_write_master(c); - if (err) - goto out; - } - - if (c->superblock_need_write) { - struct ubifs_sb_node *sup = c->sup_node; - - err = ubifs_write_sb_node(c, sup); - if (err) - goto out; - - c->superblock_need_write = 0; - } - - c->ileb_buf = vmalloc(c->leb_size); - if (!c->ileb_buf) { - err = -ENOMEM; - goto out; - } - - c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \ - UBIFS_CIPHER_BLOCK_SIZE, GFP_KERNEL); - if (!c->write_reserve_buf) { - err = -ENOMEM; - goto out; - } - - err = ubifs_lpt_init(c, 0, 1); - if (err) - goto out; - - /* Create background thread */ - c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name); - if (IS_ERR(c->bgt)) { - err = PTR_ERR(c->bgt); - c->bgt = NULL; - ubifs_err(c, "cannot spawn \"%s\", error %d", - c->bgt_name, err); - goto out; - } - - c->orph_buf = vmalloc(c->leb_size); - if (!c->orph_buf) { - err = -ENOMEM; - goto out; - } - - /* Check for enough log space */ - lnum = c->lhead_lnum + 1; - if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) - lnum = UBIFS_LOG_LNUM; - if (lnum == c->ltail_lnum) { - err = ubifs_consolidate_log(c); - if (err) - goto out; - } - - if (c->need_recovery) { - err = ubifs_rcvry_gc_commit(c); - if (err) - goto out; - - if (ubifs_authenticated(c)) { - err = ubifs_recover_size(c, false); - if (err) - goto out; - } - } else { - err = ubifs_leb_unmap(c, c->gc_lnum); - } - if (err) - goto out; - - dbg_gen("re-mounted read-write"); - c->remounting_rw = 0; - - if (c->need_recovery) { - c->need_recovery = 0; - ubifs_msg(c, "deferred recovery completed"); - } else { - /* - * Do not run the debugging space check if the were doing - * recovery, because when we saved the information we had the - * file-system in a state where the TNC and lprops has been - * modified in memory, but all the I/O operations (including a - * commit) were deferred. So the file-system was in - * "non-committed" state. Now the file-system is in committed - * state, and of course the amount of free space will change - * because, for example, the old index size was imprecise. - */ - err = dbg_check_space_info(c); - } - - mutex_unlock(&c->umount_mutex); - return err; - -out: - c->ro_mount = 1; - vfree(c->orph_buf); - c->orph_buf = NULL; - if (c->bgt) { - kthread_stop(c->bgt); - c->bgt = NULL; - } - kfree(c->write_reserve_buf); - c->write_reserve_buf = NULL; - vfree(c->ileb_buf); - c->ileb_buf = NULL; - ubifs_lpt_free(c, 1); - c->remounting_rw = 0; - mutex_unlock(&c->umount_mutex); - return err; -} - -/** - * ubifs_remount_ro - re-mount in read-only mode. - * @c: UBIFS file-system description object - * - * We assume VFS has stopped writing. Possibly the background thread could be - * running a commit, however kthread_stop will wait in that case. - */ -static void ubifs_remount_ro(struct ubifs_info *c) -{ - int i, err; - - ubifs_assert(c, !c->need_recovery); - ubifs_assert(c, !c->ro_mount); - - mutex_lock(&c->umount_mutex); - if (c->bgt) { - kthread_stop(c->bgt); - c->bgt = NULL; - } - - dbg_save_space_info(c); - - for (i = 0; i < c->jhead_cnt; i++) { - err = ubifs_wbuf_sync(&c->jheads[i].wbuf); - if (err) - ubifs_ro_mode(c, err); - } - - c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); - c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); - c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); - err = ubifs_write_master(c); - if (err) - ubifs_ro_mode(c, err); - - vfree(c->orph_buf); - c->orph_buf = NULL; - kfree(c->write_reserve_buf); - c->write_reserve_buf = NULL; - vfree(c->ileb_buf); - c->ileb_buf = NULL; - ubifs_lpt_free(c, 1); - c->ro_mount = 1; - err = dbg_check_space_info(c); - if (err) - ubifs_ro_mode(c, err); - mutex_unlock(&c->umount_mutex); -} - -static void ubifs_put_super(struct super_block *sb) -{ - int i; - struct ubifs_info *c = sb->s_fs_info; - - ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num); - - /* - * The following asserts are only valid if there has not been a failure - * of the media. For example, there will be dirty inodes if we failed - * to write them back because of I/O errors. - */ - if (!c->ro_error) { - ubifs_assert(c, c->bi.idx_growth == 0); - ubifs_assert(c, c->bi.dd_growth == 0); - ubifs_assert(c, c->bi.data_growth == 0); - } - - /* - * The 'c->umount_lock' prevents races between UBIFS memory shrinker - * and file system un-mount. Namely, it prevents the shrinker from - * picking this superblock for shrinking - it will be just skipped if - * the mutex is locked. - */ - mutex_lock(&c->umount_mutex); - if (!c->ro_mount) { - /* - * First of all kill the background thread to make sure it does - * not interfere with un-mounting and freeing resources. - */ - if (c->bgt) { - kthread_stop(c->bgt); - c->bgt = NULL; - } - - /* - * On fatal errors c->ro_error is set to 1, in which case we do - * not write the master node. - */ - if (!c->ro_error) { - int err; - - /* Synchronize write-buffers */ - for (i = 0; i < c->jhead_cnt; i++) { - err = ubifs_wbuf_sync(&c->jheads[i].wbuf); - if (err) - ubifs_ro_mode(c, err); - } - - /* - * We are being cleanly unmounted which means the - * orphans were killed - indicate this in the master - * node. Also save the reserved GC LEB number. - */ - c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); - c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); - c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); - err = ubifs_write_master(c); - if (err) - /* - * Recovery will attempt to fix the master area - * next mount, so we just print a message and - * continue to unmount normally. - */ - ubifs_err(c, "failed to write master node, error %d", - err); - } else { - for (i = 0; i < c->jhead_cnt; i++) - /* Make sure write-buffer timers are canceled */ - hrtimer_cancel(&c->jheads[i].wbuf.timer); - } - } - - ubifs_umount(c); - ubi_close_volume(c->ubi); - mutex_unlock(&c->umount_mutex); -} - -static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) -{ - int err; - struct ubifs_info *c = sb->s_fs_info; - - sync_filesystem(sb); - dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags); - - err = ubifs_parse_options(c, data, 1); - if (err) { - ubifs_err(c, "invalid or unknown remount parameter"); - return err; - } - - if (c->ro_mount && !(*flags & SB_RDONLY)) { - if (c->ro_error) { - ubifs_msg(c, "cannot re-mount R/W due to prior errors"); - return -EROFS; - } - if (c->ro_media) { - ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O"); - return -EROFS; - } - err = ubifs_remount_rw(c); - if (err) - return err; - } else if (!c->ro_mount && (*flags & SB_RDONLY)) { - if (c->ro_error) { - ubifs_msg(c, "cannot re-mount R/O due to prior errors"); - return -EROFS; - } - ubifs_remount_ro(c); - } - - if (c->bulk_read == 1) - bu_init(c); - else { - dbg_gen("disable bulk-read"); - mutex_lock(&c->bu_mutex); - kfree(c->bu.buf); - c->bu.buf = NULL; - mutex_unlock(&c->bu_mutex); - } - - if (!c->need_recovery) - ubifs_assert(c, c->lst.taken_empty_lebs > 0); - - return 0; -} - -const struct super_operations ubifs_super_operations = { - .alloc_inode = ubifs_alloc_inode, - .free_inode = ubifs_free_inode, - .put_super = ubifs_put_super, - .write_inode = ubifs_write_inode, - .drop_inode = ubifs_drop_inode, - .evict_inode = ubifs_evict_inode, - .statfs = ubifs_statfs, - .dirty_inode = ubifs_dirty_inode, - .remount_fs = ubifs_remount_fs, - .show_options = ubifs_show_options, - .sync_fs = ubifs_sync_fs, -}; - -/** - * open_ubi - parse UBI device name string and open the UBI device. - * @name: UBI volume name - * @mode: UBI volume open mode - * - * The primary method of mounting UBIFS is by specifying the UBI volume - * character device node path. However, UBIFS may also be mounted without any - * character device node using one of the following methods: - * - * o ubiX_Y - mount UBI device number X, volume Y; - * o ubiY - mount UBI device number 0, volume Y; - * o ubiX:NAME - mount UBI device X, volume with name NAME; - * o ubi:NAME - mount UBI device 0, volume with name NAME. - * - * Alternative '!' separator may be used instead of ':' (because some shells - * like busybox may interpret ':' as an NFS host name separator). This function - * returns UBI volume description object in case of success and a negative - * error code in case of failure. - */ -static struct ubi_volume_desc *open_ubi(const char *name, int mode) -{ - struct ubi_volume_desc *ubi; - int dev, vol; - char *endptr; - - if (!name || !*name) - return ERR_PTR(-EINVAL); - - /* First, try to open using the device node path method */ - ubi = ubi_open_volume_path(name, mode); - if (!IS_ERR(ubi)) - return ubi; - - /* Try the "nodev" method */ - if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') - return ERR_PTR(-EINVAL); - - /* ubi:NAME method */ - if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') - return ubi_open_volume_nm(0, name + 4, mode); - - if (!isdigit(name[3])) - return ERR_PTR(-EINVAL); - - dev = simple_strtoul(name + 3, &endptr, 0); - - /* ubiY method */ - if (*endptr == '\0') - return ubi_open_volume(0, dev, mode); - - /* ubiX_Y method */ - if (*endptr == '_' && isdigit(endptr[1])) { - vol = simple_strtoul(endptr + 1, &endptr, 0); - if (*endptr != '\0') - return ERR_PTR(-EINVAL); - return ubi_open_volume(dev, vol, mode); - } - - /* ubiX:NAME method */ - if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') - return ubi_open_volume_nm(dev, ++endptr, mode); - - return ERR_PTR(-EINVAL); -} - -static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi) -{ - struct ubifs_info *c; - - c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); - if (c) { - spin_lock_init(&c->cnt_lock); - spin_lock_init(&c->cs_lock); - spin_lock_init(&c->buds_lock); - spin_lock_init(&c->space_lock); - spin_lock_init(&c->orphan_lock); - init_rwsem(&c->commit_sem); - mutex_init(&c->lp_mutex); - mutex_init(&c->tnc_mutex); - mutex_init(&c->log_mutex); - mutex_init(&c->umount_mutex); - mutex_init(&c->bu_mutex); - mutex_init(&c->write_reserve_mutex); - init_waitqueue_head(&c->cmt_wq); - c->buds = RB_ROOT; - c->old_idx = RB_ROOT; - c->size_tree = RB_ROOT; - c->orph_tree = RB_ROOT; - INIT_LIST_HEAD(&c->infos_list); - INIT_LIST_HEAD(&c->idx_gc); - INIT_LIST_HEAD(&c->replay_list); - INIT_LIST_HEAD(&c->replay_buds); - INIT_LIST_HEAD(&c->uncat_list); - INIT_LIST_HEAD(&c->empty_list); - INIT_LIST_HEAD(&c->freeable_list); - INIT_LIST_HEAD(&c->frdi_idx_list); - INIT_LIST_HEAD(&c->unclean_leb_list); - INIT_LIST_HEAD(&c->old_buds); - INIT_LIST_HEAD(&c->orph_list); - INIT_LIST_HEAD(&c->orph_new); - c->no_chk_data_crc = 1; - c->assert_action = ASSACT_RO; - - c->highest_inum = UBIFS_FIRST_INO; - c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; - - ubi_get_volume_info(ubi, &c->vi); - ubi_get_device_info(c->vi.ubi_num, &c->di); - } - return c; -} - -static int ubifs_fill_super(struct super_block *sb, void *data, int silent) -{ - struct ubifs_info *c = sb->s_fs_info; - struct inode *root; - int err; - - c->vfs_sb = sb; - /* Re-open the UBI device in read-write mode */ - c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); - if (IS_ERR(c->ubi)) { - err = PTR_ERR(c->ubi); - goto out; - } - - err = ubifs_parse_options(c, data, 0); - if (err) - goto out_close; - - /* - * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For - * UBIFS, I/O is not deferred, it is done immediately in read_folio, - * which means the user would have to wait not just for their own I/O - * but the read-ahead I/O as well i.e. completely pointless. - * - * Read-ahead will be disabled because @sb->s_bdi->ra_pages is 0. Also - * @sb->s_bdi->capabilities are initialized to 0 so there won't be any - * writeback happening. - */ - err = super_setup_bdi_name(sb, "ubifs_%d_%d", c->vi.ubi_num, - c->vi.vol_id); - if (err) - goto out_close; - sb->s_bdi->ra_pages = 0; - sb->s_bdi->io_pages = 0; - - sb->s_fs_info = c; - sb->s_magic = UBIFS_SUPER_MAGIC; - sb->s_blocksize = UBIFS_BLOCK_SIZE; - sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; - sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); - if (c->max_inode_sz > MAX_LFS_FILESIZE) - sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; - sb->s_op = &ubifs_super_operations; - sb->s_xattr = ubifs_xattr_handlers; - fscrypt_set_ops(sb, &ubifs_crypt_operations); - - mutex_lock(&c->umount_mutex); - err = mount_ubifs(c); - if (err) { - ubifs_assert(c, err < 0); - goto out_unlock; - } - - /* Read the root inode */ - root = ubifs_iget(sb, UBIFS_ROOT_INO); - if (IS_ERR(root)) { - err = PTR_ERR(root); - goto out_umount; - } - - sb->s_root = d_make_root(root); - if (!sb->s_root) { - err = -ENOMEM; - goto out_umount; - } - - import_uuid(&sb->s_uuid, c->uuid); - - mutex_unlock(&c->umount_mutex); - return 0; - -out_umount: - ubifs_umount(c); -out_unlock: - mutex_unlock(&c->umount_mutex); -out_close: - ubifs_release_options(c); - ubi_close_volume(c->ubi); -out: - return err; -} - -static int sb_test(struct super_block *sb, void *data) -{ - struct ubifs_info *c1 = data; - struct ubifs_info *c = sb->s_fs_info; - - return c->vi.cdev == c1->vi.cdev; -} - -static int sb_set(struct super_block *sb, void *data) -{ - sb->s_fs_info = data; - return set_anon_super(sb, NULL); -} - -static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags, - const char *name, void *data) -{ - struct ubi_volume_desc *ubi; - struct ubifs_info *c; - struct super_block *sb; - int err; - - dbg_gen("name %s, flags %#x", name, flags); - - /* - * Get UBI device number and volume ID. Mount it read-only so far - * because this might be a new mount point, and UBI allows only one - * read-write user at a time. - */ - ubi = open_ubi(name, UBI_READONLY); - if (IS_ERR(ubi)) { - if (!(flags & SB_SILENT)) - pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d", - current->pid, name, (int)PTR_ERR(ubi)); - return ERR_CAST(ubi); - } - - c = alloc_ubifs_info(ubi); - if (!c) { - err = -ENOMEM; - goto out_close; - } - - dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id); - - sb = sget(fs_type, sb_test, sb_set, flags, c); - if (IS_ERR(sb)) { - err = PTR_ERR(sb); - kfree(c); - goto out_close; - } - - if (sb->s_root) { - struct ubifs_info *c1 = sb->s_fs_info; - kfree(c); - /* A new mount point for already mounted UBIFS */ - dbg_gen("this ubi volume is already mounted"); - if (!!(flags & SB_RDONLY) != c1->ro_mount) { - err = -EBUSY; - goto out_deact; - } - } else { - err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0); - if (err) - goto out_deact; - /* We do not support atime */ - sb->s_flags |= SB_ACTIVE; - if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT)) - ubifs_msg(c, "full atime support is enabled."); - else - sb->s_flags |= SB_NOATIME; - } - - /* 'fill_super()' opens ubi again so we must close it here */ - ubi_close_volume(ubi); - - return dget(sb->s_root); - -out_deact: - deactivate_locked_super(sb); -out_close: - ubi_close_volume(ubi); - return ERR_PTR(err); -} - -static void kill_ubifs_super(struct super_block *s) -{ - struct ubifs_info *c = s->s_fs_info; - kill_anon_super(s); - kfree(c); -} - -static struct file_system_type ubifs_fs_type = { - .name = "ubifs", - .owner = THIS_MODULE, - .mount = ubifs_mount, - .kill_sb = kill_ubifs_super, -}; -MODULE_ALIAS_FS("ubifs"); - -/* - * Inode slab cache constructor. - */ -static void inode_slab_ctor(void *obj) -{ - struct ubifs_inode *ui = obj; - inode_init_once(&ui->vfs_inode); -} - -static int __init ubifs_init(void) -{ - int err = -ENOMEM; - - BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); - - /* Make sure node sizes are 8-byte aligned */ - BUILD_BUG_ON(UBIFS_CH_SZ & 7); - BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); - - BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); - BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); - BUILD_BUG_ON(MIN_WRITE_SZ & 7); - - /* Check min. node size */ - BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); - BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); - BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); - BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); - - BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); - BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); - BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); - BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); - - /* Defined node sizes */ - BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); - BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); - BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); - BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); - - /* - * We use 2 bit wide bit-fields to store compression type, which should - * be amended if more compressors are added. The bit-fields are: - * @compr_type in 'struct ubifs_inode', @default_compr in - * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. - */ - BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); - - /* - * We require that PAGE_SIZE is greater-than-or-equal-to - * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. - */ - if (PAGE_SIZE < UBIFS_BLOCK_SIZE) { - pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes", - current->pid, (unsigned int)PAGE_SIZE); - return -EINVAL; - } - - ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", - sizeof(struct ubifs_inode), 0, - SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT | - SLAB_ACCOUNT, &inode_slab_ctor); - if (!ubifs_inode_slab) - return -ENOMEM; - - ubifs_shrinker_info = shrinker_alloc(0, "ubifs-slab"); - if (!ubifs_shrinker_info) - goto out_slab; - - ubifs_shrinker_info->count_objects = ubifs_shrink_count; - ubifs_shrinker_info->scan_objects = ubifs_shrink_scan; - - shrinker_register(ubifs_shrinker_info); - - err = ubifs_compressors_init(); - if (err) - goto out_shrinker; - - dbg_debugfs_init(); - - err = ubifs_sysfs_init(); - if (err) - goto out_dbg; - - err = register_filesystem(&ubifs_fs_type); - if (err) { - pr_err("UBIFS error (pid %d): cannot register file system, error %d", - current->pid, err); - goto out_sysfs; - } - return 0; - -out_sysfs: - ubifs_sysfs_exit(); -out_dbg: - dbg_debugfs_exit(); - ubifs_compressors_exit(); -out_shrinker: - shrinker_free(ubifs_shrinker_info); -out_slab: - kmem_cache_destroy(ubifs_inode_slab); - return err; -} -/* late_initcall to let compressors initialize first */ -late_initcall(ubifs_init); - -static void __exit ubifs_exit(void) -{ - WARN_ON(!list_empty(&ubifs_infos)); - WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0); - - dbg_debugfs_exit(); - ubifs_sysfs_exit(); - ubifs_compressors_exit(); - shrinker_free(ubifs_shrinker_info); - - /* - * Make sure all delayed rcu free inodes are flushed before we - * destroy cache. - */ - rcu_barrier(); - kmem_cache_destroy(ubifs_inode_slab); - unregister_filesystem(&ubifs_fs_type); -} -module_exit(ubifs_exit); - -MODULE_LICENSE("GPL"); -MODULE_VERSION(__stringify(UBIFS_VERSION)); -MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); -MODULE_DESCRIPTION("UBIFS - UBI File System"); |